package com.sqq.util;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.math.BigInteger;
import java.nio.MappedByteBuffer;
import java.nio.channels.FileChannel;
import java.security.MessageDigest;

public class MD5Util {
	
	 public static String getMd5ByFile(File file) throws FileNotFoundException {
	        String value = null;
	        FileInputStream in = new FileInputStream(file);
		try {
		    MappedByteBuffer byteBuffer = in.getChannel().map(FileChannel.MapMode.READ_ONLY, 0, file.length());
		    MessageDigest md5 = MessageDigest.getInstance("MD5");
		    md5.update(byteBuffer);
		    BigInteger bi = new BigInteger(1, md5.digest());
		    value = bi.toString(16);
		} catch (Exception e) {
		    e.printStackTrace();
		} finally {
	            if(null != in) {
		            try {
			        in.close();
			    } catch (IOException e) {
			        e.printStackTrace();
			    }
		    }
		}
		return value;
	    }
}
